Prepay postpay paystation



5 Sheets-Sheet 1 Filed May 25, 1956 INVENTOR.

CLARENCE E. LOMAX "fl ATTY.

Dec. 26, 1961 c. E. LOMAX PREPAY POSTPAY PAYSTATION Filed May 25, 1956 IN V EN TOR.

5 Sheets-Sheet 5 CLARENCE E. LOMAX BY 2/" ATTY.

Dec. 26, 1961 c. E. LOMAX 3,014,986

PREPAY POSTPAY PAYSTATION Filed May 25, 1956 5 Sheets-Sheet 4 LO,MAX

INVENTOR.

CLARENCE E ATTY.

Dec. 26, 1961 c. E. LOMAX 3,014,986

PREPAY PO STPAY PAYSTATION Filed May 25. 1956 5 Sheets-Sheet 5 E IO K1 IO m {D Q 2 g 1 Q M J In iLL INVENTOR.

CLARENCE E. LOMAX ATTY.

3,014,986 Patented Dec. 26, 1961 I fificc 3,914,986 PREPAY PQSTPAY PAYSTATEGN Clarence E. Lomax, Chicago, Iii, assignor to Automatic Electric Laboratories, Inc., a corporation of Deiaware Filed May 25, 1956, Ser. No. 587,293 3 Ciairns. (31. 176.3)

This invention relates to an arrangement for providing prepay postpay paystation services at a paystation in a C.A.X having toll service furnished by an operator at a nearby exchange.

A previous U.S. Patent 2,921,980, issued January 19, 1960, to C. E. Lomax disclosed a circuit arrangement for use with a mechanism disclosed by Hans Sengebusch in U.S. Patent 2,905,763, issued September 22, 1959, whereby a paystation is controlled to function as a prepay paystation on initiation of a call, and as a postpay paystation on a toll call. This paystation arrangement is known as a prepay postpay paystation. In previous prepay postpay arrangements the coin magnet control is performed over the two line conductors thereby necessitating rather expensive and complicated central oflice equipment.

That is the most economical arrangement where a number of paystations are provided in one central office or exchange. However, small exchanges such as C.A.Xs require only a few paystations and as these exchanges have a minimum of equipment and service, it has generally been the practice that such exchanges are equipped only with postpay paystations, while toll service therefor is provided by an operator in a nearby exchange.

The present invention enables the use of a prepay paystation with a conventional coin receiving arrangement and coin magnet at a C.A.X having only the minimum of equipment and service. This is accomplished by eliminating the need for high voltage coin magnet potential to operate the coin magnet. In the present invention the paystation coin magnet is provided with an individual connection to the C.A.X central office and as only a few paystations are involved this is not an uneconomical arrangement. The coin magnet armature is placed under comparatively light spring tension as contrasted with the ordinary arrangement wherein the coin magnet is connected to the line conductors, necessitating that its armature be under heavy spring tension to ensure that the coin magnet circuit opens when the high voltage coin magnet control potential is removed from the line conductors. The coin magnet in the present arrangement can therefore operate on the normal 48 volt exchange potential, which is generally the only kind available at the C.A.X central oirlce. The use of the individual coin magnet connection to the central ofiice also eliminates the need for a paystation repeater as the coin magnet does not interfere with dial pulses. By placing the paystation in the postpay condition on toll calls, the coin load does not exceed two nickels or a dime thereby also serving to eliminate the need for high voltage to provide sufficient power to operate the coin magnet under a heavy coin load. This avoids the many difiiculties inherent in forwarding the high voltage from a distant exchange such as would be necessary when the C.A.X prepay paystations are provided with toll service from another exchange.

The collect operation being the most frequent, negative exchange battery is used for operating the coin magnet to the collect position, while the occasional refund operation utilizes positive battery which is provided for by dry cells in any well-known manner. The above and other advantages, objects and features will become clear on further reading of the. specification and claims in conjunction with the drawings.

Referring to the drawings, FIG. 1 discloses the paystation 100; FIG. 2 discloses the line circuit 206 individual to paystation FIGS. 3 and 4 disclose a repeater 300 at the C.A.X central ofice and connected over a pair of trunk conductors +T and -T to an operators position at a nearby exchange M; and FIG. 5 discloses the operator circuit at the position. i

Local calls between subscribers utilizing the central office equipment are completed through any we'll-known type of switch train comprising finder, selector and connector switches. Toll calls, which are serviced by an operator in' nearby exchange M, are first routed from a finder-selector link such as indicated by block 210 through a repeater 300 to the operators circuit at exchange M shown in FIG. 5 for the purpose of signalling the operator. The call is answered by the operator and then she secures the called party in any well-known manner. If the call is released before the operator secures the called party any coin on deposit is automatically refunded. The operator also has access to subscribers at the C.A.X through the repeater 300 and an incoming selector (not shown) of any wellknown type associated with the repeater. The operators call is extended over the incoming selector and then over a connector switch such as indicated by the block 220' to a called line in any well-known manner.

Paystation 100 has a pair of talking conductors L1 and L2 extending to line circuit 200 at the central office. A finder-selector link such as 210, is associated with the calling line on initiation of a call, but the subscriber cannot dial due to the coin springs C830 or 32 shunting the dial springs 31 until the proper coin value is deposited. The coin magnet 40 and a nickel spring restoring magnet 50 at the paystation are connected over a conductor L3 to the line equipment at the central ofiice. A shunt field polar relay 140 in the line circuit is operated when battery is reversed on the line. It in turn controls the application of collect potential to conductor L3 for operating the coin magnet 40 to collect the deposited coin. Relay 140 is operated on answer of a call extended from paystation 100 to another subscriber in the central ofiice and under control of an operator in nearby exchange M. It is also operated on a call to paystatio-n 100. If relay 140 has not operated by the time the call is released relay is effective-to apply refund potential to conductor L3 for causing any coin on deposit to be refunded. The collect potential is maintained on coin magnet control conductor L3'for the duration of the call thereby maintaining the coin magnet operated during the call and without interfering with the v The conventional coin receiving mechanism is therecall. fore maintained in condition wherein any coins deposited are collected by virtue of their deposit alone and continuous collect attempts such as may be necessary on a-to-ll call are avoided.

In detail a subscriber on initiating a call from paystation 100 lifts his receiver to close hookswi-tch springs Zil. This completes a circuit from ground at contacts (FIG. 2) in 152, through the left winding of relay shunt with resistance 115, the L2 conductor, coin transmitter 2.1 in shunt with resistor 22, transmitter 23, coil 24,'hookswitch springs 20, coin springs C530 in shunt with dial springs 31, the L1 conductor and-contacts 151 to battery through relay 160. Relay 140 does not operate in this circuit. Line relay 169 operates in this circuit to close contacts 161, 162 andl-i' and open contacts 163. At contacts 154, a circuit is completed for initiating the operation of any well-known type of allotter (not shown) which in turn causes a finder-selector link such as 210 of any well-known type to be associated with the calling line. The finder of the link finds the calling line and returns ground over the C lead and contacts 161 to operate relay 150. in the meantime ground at contacts 152 is placed on conductor CN to busy the line circuit 260 to incoming calls.

Relay 150 closes its X contacts first to complete its own holding circuit from ground on the C lead and then opens contacts 151 and 152 so that relay 160 restores. The loop circuit from the calling paystation is now extended to the line relay of the selector switch in finderselector link 210 and ground is returned over the C lead from the selector for maintaining relay 150 operated. Relay 150 also closes contacts 153 to complete a circuit for slow-to-release relay 129 over contacts 133, and it also opens contacts 154. At contacts 153 a circuit is also completed to the right winding of relay 140, but it does not operate. Relay 12% operates to prepare a circuit for relay 110 at contacts 121. Relay 160 on releasing had opened contacts 162, but at contacts 163 the ground from the C lead and through X contacts of relay 150 is forwarded to the CN conductor to maintain line circuit 200 busy to incoming calls. A paystation identification tone is forwarded over condenser C115, contacts 163 and the X contacts of relay 150 to the C lead to enable an operator to identify the paystation call, if the call proceeds thereto.

The calling party receives dial tone from the link 210, and must deposit the proper coin value before he can effectively operate his dial springs 31 as they are shunted by the coin springs C530. As the prescribed coin value is ten cents the calling party must deposit either a dime or two nickels. If he deposits a dime, springs C830 open to remove the shunt around dial springs 31. If he deposits one nickel, springs C830 open, but springs C832 close to maintain a shunt around the dial springs. By depositing a second nickel he opens springs C532 to remove the shunt around dial springs 31, all of which is done in any well-known manner.

The calling party dials the number of the desired local party and on completing the connection through a connector switch such as 220 and answer by the called party, battery is reversed on the line conductors all in any wellknown manner.

As the battery on the line conductors is now reversed, current flows in a reverse direction through the left winding of shunt field polar relay 140 in shunt with resistor 115, and it operates to close contacts 141. This completes a circuit from contacts 153 for operating relay 130. Relay 130 operates to close contacts 131 and 132 and open contacts 133. At contacts 131, negative exchange battery is returned over contacts 111 to conductor L3, coin magnet 46 and nickel spring restoring magnet 50. Both operate in this circuit. Their operation ensures that springs C830 and C532 are returned to their original position and therefore the subscriber is thereafter prevented from operating the switching equipment. This also occurs on a refund operation where it is important that a subscriber be prevented from using the equipment without an appropriate deposit. Magnet 40 pivots the plate beneath the conventional coin retaining member in the coin chute to the collect position and the deposited coin or coins on over-balancing the member fall into the collect box. Relay 130, at contacts 132, completes a holding circuit for itself from contacts 153 and at contacts 133 it opens the circuit to relay 120, which restores. Relay 130 thereafter maintains the collect potential on the L3 conductor for maintaining coin magnet 40 oper= ated. Any coins now deposited in the conventional coin receiving mechanism over-balance the coin retaining member and fall directly into the collect box.

The parties may now converse, and on release of the connection the finder-selector link 2111 is restored in any well-known manner to remove ground from the C lead. Relay 150 restores to open the circuit to the right winding of relay 140 at contacts 153 and to the winding of relay 130. Line circuit 200 is now restored to normal.

In the event of the release of the connection before answer of any call, ground is removed from the C lead as before to restore relay 150. It in turn opens the circuit to slow-to-release relay 120 at contacts 153. In this case relay 120 is operated until relay 150 restores as relays 140 and 130 are not operated. Relay 124} holds its contacts operated long enough to ensure the operation of relay over contacts 154 and 121. Relay 110 closes contacts 112 to apply refund potential to the L3 conductor for operating the magnets connected thereto and any deposited coin is refunded. Relay then opens the circuit to relay 111) at contacts 121 and relay 110 also restores to remove the refund potential from conductor L3.

On a toll call the calling party after having made the proper deposit dials a predetermined toll digit on the selector switch to step it to the repeater level. The selector switch searches for an idle repeater having a trunk to the nearby exchange M. On finding battery over a lead such as CNl contacts 321, 363 and 411 indicating that Repeater 360 is idle, the selector switch extends the loop from the calling paystation over contacts 311, the L conductor, upper left winding of repeating coil 490, the -L1' conductor, contacts 364, to battery through the upper winding of relay 340 and from contacts 313 to the +L conductor through the lower left Winding of repeating coil 490, the +L1 conductor, contacts 366 to ground through the lower winding of relay 348.

Relay 340 operates and closes contacts 341 to operate slowto-release relay 330. It also closes contacts 342 to prepare a circuit to relay 480. Relay 330 closes contacts 331, 332 and 333. At contacts 331 a circuit is completed to relay 320, which operates to open contacts 321 and remove battery from conductor CNl. It also closes contacts 322 to place ground on conductor CN1 from conductor 425 and the lower winding of impedance 420 to hold the preceding switch. At contacts 323 relay 320 prepares its own holding circuit, and at contacts 324 it opens a point in a circuit to relay 360 and the right winding of shunt field polar relay 370. At contacts 325 it prepares a circuit for the upper winding of relay 350 and at contacts 326, it completes a circuit over formerly operated contacts 342 and conductor 426 for operating. relay 480.

In the meantime contacts 332 complete a circuit from ground at contacts 446 and conductor 427, over contacts 332 and conductor 428 to slow-to-release relay 430. Relay 43G closes contacts 431 and 432 to prepare a circuit for providing the operator with paystation tone'identification. At contacts 333 a ring back tone is transmitted from contacts 354 over the loop to the calling party.

A loop circuit is normally completed from battery through the upper winding of relay 460, the upper winding of dirferential relay 470 in shunt with contacts 351, the upper right winding of coil 49%, contacts 482, -T

conductor to the operators circuit at the nearby exchange M, key contacts 591, the upper left winding of coil 590, contacts 511, polar relay 530, lower left winding of coil 590, key contacts 594, the +T conductor to repeater 300, contacts 484, the lower right winding of coil 490, lower winding of differential relay 470 in shunt with contacts 352 to ground through the lower winding of relay 460. Polar relay 530 is a high resistance relay and is normally operated in this circuit to maintain its contacts 531 open, while preventing relay 469 from operating.

When relay 481) operates it reverses the battery on the trunk conductor +1 and T by closing contacts 481 and 483 and opening contacts 482 and 484. Relay 530 is therefore caused to operate its contacts 531 in a reverse direction to close them. A circuit is now completed over contacts 512 for lighting the operators calling signal lamp 550.

The operator noticing the signal inserts her plug in jack J5 and closes contacts J6 to complete a circuit to relay 51G. Relay 510 opens contacts 512 to disconnect the calling signal lamp 550; opens contacts 511 to discon nect relay 5311 from the -T trunk conductor and at contacts 513 connects the T trunk conductor to relay 520 to insert relay 520 in the loop circuit to relay 460. Relay 530 is now restored. Relay 520 is a comparatively low resistance relay and therefore relay 460 operates. Relay 520 is poled so as not to operate its contacts, while relay 480 is operated to maintain reversed battery on the trunk conductors +T and T. Relay 460 closes contacts 461 to prepare a loop circuit to the line relay of an incoming selector (not shown) associated with repeater 300. At contacts 462, relay 460 completes a circuit to slow-torelease relay 450, which operates to complete a circuit to relay 440 at contacts 451. Relay 440 operates to close contacts 441 and 442 so that the upper winding of impedance 420 is now connected across the left windings of repeating coil 490, as previously operated relay 430 had prepared this connection at contacts 431 and 432. At contacts 443, relay 440 prepares a circuit to slow-to release relay 410, and at contacts 444 it completes a holding circuit over conductor 429 and contacts 323 to relay 320. At contacts 445 a circuit is completed over conductor 418 tothe upper winding of relay 350 through contacts 325, and at contacts 446 the circuit is opened to slow-to-release relay 430, which starts to restore.

The paystation identification tone, which is forwarded over the C lead from the line circuit and the CNl conductor to the lower winding of impedance 420 is induced in the upper winding of impedance 420 connected across the left winding of repeating coil 490. This tone is now transmitted over the T and +T conductors and is available to the operator before slow-to-release relay 430 is restored. When relay 430 is completely restored the tone is disconnected by the opening of contacts 431 and 432. If the operator was not sure as to the tone she may repeat this operation by removing her plug from jack J to restore relay 510 thereby reconnecting relay 530, while disconnecting relay 520. Relay 460 will therefore release to restore relay 450. Relay 440 is then restored and the operator on re-inserting her plug may again complete the described sequence for testing for a paystation tone.

Relay 350 on operating opens contacts 351 and 352 to open the shunts around the upper and lower windings respectively of differential relay 470. Relay 47% does not operate, however, due to its differential construction. At contacts 353 an operating circuit for the lower winding of relay 350 is completed from contacts 326. At contacts 354 the circuit for returning ring back tone to the calling party is opened. The ring back tone circuit is not recompleted in the event the operatorhad repeated the paystation tone test as the lower winding of relay 350 is held operated, in the interval the operators plug is removed, over the just mentioned operating circuit.

The operator and the calling party may now converse and the proper information secured by the operator. When the operator has secured the called party she momentarily operates non-locking key K540 to place ground on both the T and +T conductors. Only one winding of differential relay 476 is therefore energized. Relay 47%) operates and closes contacts 471 to complete a circuit from ground at contacts 445'and conductor 418 over conductor 476 to relay 310, which operates to close contacts 312 and 314 and open contacts 311 and 313. This operation reverses battery on the loop circuit to the calling party. At contacts 315 relay 310 completes a holding circuit for itself from contacts 445 and conductor 418. Key K549 on restoring removes the ground from the +1 and T conductors to restore diiferential relay 476. The restoration of relay 47% opens the original operating circuit for relay 310 at contacts 471, but it remains-operated over its just described holding circuit.

With reversal of battery on the loop, shunt field polar relay 140 is operatedto close contacts 141 and the aforeescribed procedure for retaining the coin magnet operated is completed. The operator may now complete the call and request the deposit of as many coins as necessary,

which will fall directly into the coin hopper without the necessity of any collect operation on the operators part.

Release of the toll call by the calling subscriber opens the loop to relay 340 and it restores to open contacts 341 and 342. Opening contacts 342 restores relay 480 so that battery and ground from the respective windings of 460 are connected to the T and +1 conductors in the original manner. This energizes relay 520 at the operators position in a direction to operate its contacts. Contacts 521 therefore close to operate supervisory lamp 555 for signalling the operator that the calling party has released the call.

At contacts 341 slow-to-release relay 330 is restored and it opens contacts 331, and 332 and 333. The circuit to relay 430 is already opened at contacts 446 and there fore opening contacts 332 merely prevents the completion of that circuit when the operator releases the connection. Opening contacts 333 has no eifect as the ring back tone had been disconnected at contacts 354. At contacts 331, one circuit to relay 320 is opened, however it is held operated over its previously described holding circuit including contacts 323, conductor 429 and contacts 444.

The operator on noticing the calling party has released the connection, removes her plug from jack J5 to open contacts I 6 thereby restoring relay 510. Relay 510 opens contacts 513 to disconnect relay 520 which restores to open the circuit to lamp 555 at contacts 521, and reconnects relay 536 in its operating circuit at contacts 511. Relay 530 operates to open contacts 531 and due to its insertion in the circuit to relay 460, it causes that relay to restore.

Relay 460 on restoring opens contacts 462 and closes contacts 463. Slow-to-release relay 450 restores, when contacts 462 open, to open the circuit to relay 449 at contacts 451. Relay 440 restores, and opens the holding circuit to relay 320 at contacts 444. It also opens the holding circuit to relay 310 at contacts 445. Relays 320 and 310 restore.

When the calling party restored the connection the line loop which includes the left winding of relay 140 was opened and relay 140 restored to open contacts 141. Relays 130, however remained operated over its holding circuit to maintain the collect potential on conductor L3. When relay 320 in the repeater 300 restores it opens contacts 322 to remove ground from the CNl conductor and therefore the finder-selector link restores. The ground being therefore removed from the C lead causes relay 150 to restore. Relay 150 on restoring opens contacts 153 to restore relay and the collect potential is now removed from conductor L3.

In the case of an uncompleted toll call the operator does not operate key K540 to cause the aforedescribed series of operations for operating relays 470 and 310 in turn, which control the application of collect potential to the L3 conductor by operating relays and 130 as described. When the operator and the calling party then release the connection, refund potential is applied to the L3 conductor to refund any deposited coin in a manner described as relay 120 is operated instead of 130' at the time relay restores.

In the event the operator removes her plug before the calling party releases, relay 510' is restored as described to reconnect relay 530 in the loop to relay 460. However, as relay 480 is operated, the direction of current on the loop is such that relay 530 maintains 531 closed thereby operating lamp 550 to inform the operator the calling party is still onthe linen If the operator'desires to extenda toll call to a subscriber in the central oifice or in the event both'the operator and the calling party havereleased the connection and she wants to re-establish it, she inserts her plugin jack 15 to operate relay 519 as described. Relay 53E is then disconnected from the loop to 460 and relay 520 is connected therein instead to enable relay 460 to operate. As relay 484 is not now operated the direction of c rent on the +T and T conductors is such as to cause relay 520 to close contacts 521 for lighting lamp 555. Relay 460 operates relay 450 as before described and it in turn operates relay 440 at contacts 451.

A circuit is now completed from contacts 444 over conductor 429 and contacts 324 to relay 369 and the right winding of shunt field polar relay 370 in shunt with relay 360. Relay 360 operates to close contacts 361, 362, 365, 367 and 368 and open contacts 363, 364 and 366. Opening contacts 363, opens the circuit for providing battery to the CN1 conductor to thereby prevent repeater 360 from being seized on an incoming call. At contacts 364 and 366 the before described loop circuit for relay 340 is maintained opened. At contacts 361 and 362 a loop circuit is completed to the line relay of an incoming selector associated with repeater 300 from the L2 conductor, contacts 461, contacts 361, the -L1' conductor, the upper left winding of repeating coil 490, contacts 365, the left winding of relay 370, contacts 363, the +L1' conductor, lower left winding of coil 490, contacts 362 and over the +L2 lead. Shunt field polar relay 370 does not operate in this circuit. At contacts 367 a circuit is prepared to slow-to-release relay 410. The operator now operates her locking key 595 to open contacts 591 and SM and close 592. and 593. This disconnects relay 520 from the loop to relay 460- at contacts 591 and 594 and at contacts 592 and 593 connects the operators dial equipment (not shown) and which is of any well-known type, over the T and +T conductors to relay 460. Relay 520 is restored to open contacts 521 and extinguish lamp 555.

' The operator now operates her dial to pulse relay 466. Relay 460 in turn pulses contacts 461 for the purpose of pulsing the line relay of the incoming selector. This steps the selector switch to a level corresponding to the dialled digit. Here it proceeds to search for and find an idle connector switch such as 220 indicated in FIG. 2.

At contacts 462 the circuit to relay 450 is intermittently opened, but as it is slow-to-release it remains operated during the dialling of each digit. On the first closing of contacts 463 a circuit is completed over contacts 443, conductor 419 and contacts 367 to slow-to-release relay 410. Relay 410 opens contacts 411 to open another point in the circuit for providing battery to the CN1 conductor and at contacts 412 applies a resistance shunt to the left winding of relay 370 to prevent it from interfering with the pulsing of the switch line relay.

The operator dials the remaining digits of the called partys number on the connector switch, which is then stepped to the called partys line. If the call is being extended to a prepay postpay paystation such as 166 the connector switch tests for battery over the CN lead, contacts 163 and the winding of relay 150. If it finds ground indicating the line is busy, a busy signal is returned to the operator in any well-known manner. On finding battery indicating the called line is idle, a ground extended from the connector switch over the CN conductor and contacts 163 operates relay 156, which in turn disconnects relay 160 from the line conductors and operates slowto-release relay 120 at contacts 153. It simultaneously completes a circuit for the right winding of relay 14! Ringing current is transmitted over the normals +N and -N to signal the called party in any well-known manner.

On answer by the called party the connector ring out off relay (not shown) is operated in any well known manner and a circuit is-completed through the left winding of relay 140 in shunt with resistance 11.5. As the connector normals +N and N feeding battery to the called line are reversed, polar relay ldtl operates. A described sequence for operating relay 130 to place collect potential over conductor L3, and for restoring relay 126 then takes place.

The called party on answering the call also operates the back bridge relay (not shown) of the connector switch to reverse battery on the loop to the repeater in any wellknown manner. Shunt field polar relay 370 therefore operates to close contacts 371. This operates relay 430'. The operator having opened key 595 to reoperate relay 520 in the loop to relay 460 at contacts 591 and 594, now receives an answer signal due to relay 529 restoring to open contacts 521 and darken lamp 555.

The paystation coin magnet 40 and nickel spring re storing magnet 56 are operated by the collect potential applied over conductor L3 so that if the call is a reverse charge call, coins may be collected without the necessity of the operator performing a collect operation. Magnet 51} insures that the nickel springs are returned to their unoperated condition despite the deposit of an odd number of nickels.

The called party on restoring opens the circuit to the back bridge relay of the connector switch to in turn restore the original battery to the loop including relay 37 ti. Relay 37 restores to open the circuit to relay 480 at contacts 371. Relay 480 restoring causes relay 520 to operate its contacts 521, and light lamp 555 to indicate that the call is released.

The operator removes her jack to disconnect relay 510 which in turn restores relay 520, and also operates relay 53% to restore relay 460 all as previously described. Relay 460 restoring restores relay 450 which in turn restores relay 440 all as described. Restoration of relay 440 deenergizes relay 360 and the right winding of relay 370 at contacts 444.

Contacts 461 being held open by relay 460 causes the restoration of the connector switch and incoming selector all any well-known manner. The release of the connector switch removes ground from the CN connector to restore relay 150 in the called line circuit. It in turn opens the circuit to the right winding of relay 140 and restores relay so that line circuit 209 is restored to normal.

Thus having described an embodiment of my invention, I am appending hereto a series of claims which I believe encompasses the scope of my invention.

What is claimed is:

1. In a telephone system, a line having a paystation thereon, an individual line circuit connected with said paystation line over a connection including a pair of talking conductors and a control conductor, a source of exchange potential in said line circuit, relay means in said line circuit, a called subscriber line, switching means for extending the portion of said connection including said pair of talking conductors to signal said called subscriber line in response to the initiation of a call by said paystation, control means connected to one of said talking conductors in said line circuit operated in response to the answering of said extended signalling connection by said called subscriber, means operated by said control means for operating said relay means, means operated in response to said operation of said relay means for continuously applying said exchange potential to said control conductor, and a coin disposal magnet in said paystation connected to said control conductor operated in response to receipt of said exchange potential for initiating a coin disposal operation in said paystation.

2. In a telephone system, a line having a paystation thereon, an individual line circuit connected with said paystation line over a connection including a pair of talking conductors and a control conductor, a source of a certain polarity of exchange potential in said line circuit, a source of a different polarity of exchange potential in said line circuit, a first and a second relay means in said line circuit, a called subscriber line, switching means for extending the portion of said connection including said pair of talking conductors to signal said called subscriber line in response to the initiation of a call by said paystation, control means connected to one of said talking conductors in said line circuit operated only in response to the answering of said extended signalling connection by said called subscriber, means operated by said control means for operating the first of said relay means, means operated in response to said operation of said first relay means for connecting said exchange potential of said certain polarity to said control conductor, a coin disposal magnet in said paystation connected to said control conductor operated in response to receipt of said exchange potential of said certain polarity for initiating a certain type of coin disposal operation in said paystation, means including a relay controlled by said switching means only in response to the abandonment of said extended signalling connection by said paystation before said called subscriber answers for operating the second of said relay means, and means operated in response to said operation of said second relay means for connecting said exchange potential of said different polarity to said control conductor, whereby said coin disposal magnet in said paystation is operated in response to receipt of said exchange potential of said different polarity for initiating a different type of coin disposal operation in said paystation.

3. In a telephone system, a line having a paystation thereon, an individual line circuit connected with said paystation line over a connection including a pair of talking conductors and a control conductor, an operator position, a repeater circuit terminating at said operator position, switching means operated in response to the initiation of a call by said paystation for extending a signalling connection including said pair of talking conductors over said repeater circuit to said operator position, a source of exchange potential in said line circuit, relay means in said line circuit, control means in said repeater circuit operated in response to the answer of said signalling connection at said operator position, means in said repeater circuit operated in response to said operation of said control means for reversing the connection of said pair of talking conductors with said switching means, polarized relay means connected to one of said talking conductors in said line circuit operated in response to said reversal of said pair of talking conductors, means operated by said operation of said polarized relay means for operating said relay means, means operated in response to said operation of said relay means for continuously applying said exchange potential to said control conductor, and a coin disposal magnet in said paystation connected to said control conductor continuously operated in response to receipt of said exchange potential for initiating a coin disposal operation in said paystation to continuously collect all subsequently deposited coins.

References Cited in the file of this patent UNITED STATES PATENTS 651,817 Gelanger June 19, 1900 764,752 McBerty July 12, 1904 950,004 Monson Feb. 22, 1910 2,271,681 Davidson Feb. 3, 1942 

